it seems fishy, it smells fishy
exp.
ça sent mauvais, ça a l'air louche
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First match in Français-Anglais / English-French dictionary:
fishy
adj
[taste, smell] de poisson
→ this will help to eliminate any fishy odours
(made with fish)
[dish] au poisson
→ fishy summer pastas and salads
(=suspicious) suspect (e) , louche
→ There seems to be something fishy going on.
It all sounds rather fishy to me. Ça m'a l'air louche.
Translation English - French Collins Dictionary  

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